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Finding the Fourth Proportional to 2,077.86, 3,117.63 and 779.43

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Solution

The fourth proportional to 2,077.86, 3,117.63 and 779.43 is: 1,169.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,077.86 : 3,117.63 = 779.43 : x
  2. Step 2: Convert to fraction form
    2,077.86/3,117.63 = 779.43/x
  3. Step 3: Cross multiply
    2,077.86x = 3,117.63 × 779.43
  4. Step 4: Simplify right side
    2,077.86x = 2,429,974.35
  5. Step 5: Solve for x
    x = 2,429,974.35/2,077.86
  6. Step 6: Final answer
    x = 1,169.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.